CN203906202U - Plunger type hydraulic pump with linear motor - Google Patents

Abstract

The utility model discloses a plunger type hydraulic pump with a linear motor. The plunger type hydraulic pump comprises a left plunger and a right plunger. The left plunger and the right plunger are fitly disposed in respective cavities. The plunger type hydraulic pump is characterized by further comprising two linear motors, stators of the linear motors are collinear, a hinge sliding base is fixed to a rotor of each linear motor, the left plunger and the right plunger are symmetrically arranged using the stators of the linear motors as a symmetric axis, two toggle rods are hinged to each of the left plunger and the right plunger, and the other ends of each two toggle rods are hinged to one hinge sliding base. A friction mode of the plunger motion process of the plunger type hydraulic pump is very simple, the service life of the plunger type hydraulic pump can be significantly prolonged, mechanical efficiency thereof can be improved, and energy saving is favored.

Description

Adopt the pluger type hydraulic pump of linear electric motor

Technical field

The utility model belongs to mechanical field, relates to a kind of pluger type hydraulic pump that adopts linear electric motor, in particular for the pluger type hydraulic pump of hudraulic lift drive system.

Background technique

At present, in the Metering Flow Control Circuits Hydraulic Adjustable Speed technology of industrial field extensive use, mainly contain the Metering Flow Control Circuits of metering pump and throttle valve composition and two kinds of the pump speed control systems that driven by variable displacement pump.Powerful, flow and the continuously adjustable oil hydraulic pump of pressure are mainly cam-type axial piston pumps, but the structure of cam-type axial piston pump is very complicated, particularly plunger will bear the moment being formed by radial force, thereby its friction condition is worsened, and working life and mechanical efficiency reduce.In addition, be connected in the piston shoes complex structure of plunger lower end, friction condition is extremely severe, adds complicated flow system etc., makes the manufacturing process of plunger pump extremely complicated.Traditional cam-type axial piston pump also has a critical defect can not be ignored, it is instability of flow, produce so-called pulsation rate, as wish reduces flow pulse rate, not only need to increase the number of plunger, and the number that needs plunger is prime number, for example 3,5,7,11,13,17,19,23 etc.Therefore, the plunger of excessive number is actual is a kind of helpless selection, not only causes mechanism's complexity, and manufacture cost is high.At present, extremely low in the energy utilization rate of the Metering Flow Control Circuits of industrial field extensive use, be only applicable to the occasion of small-power transmission, the occasion of, continuous speed adjustment high-power at needs, the pump speed control system that often adopts variable displacement pump to drive.And powerful, flow and the continuously adjustable oil hydraulic pump of pressure are mainly cam-type axial piston pumps, former high-quality cam-type axial piston pump mainly depends on import, is mainly the product of German BOSCH-REXROTH and Kawasaki, Japan company, and price is extremely expensive.Cam-type axial piston pump with engineering machinery regular size is given an example, and separate unit price is generally more than 30,000 yuans.Recently, Shandong Zhong Chuan hydraulic pressure has successfully been produced high-quality oil hydraulic pump that can substituting import one, and separate unit price is also 20,000 yuans of left and right.So fancy price has caused enormous pressure to downstream industry.

Notice of authorization number is that the Chinese patent of CN102207066B also discloses the double-action plunger pump that a kind of symmetrical toggle link drives, but this double-action plunger pump has only represented afterbody mechanical transmission, if the reducing gear of front end and drive motor in increase, will find that the integral layout of this double-action plunger pump is very asymmetric.In addition, the elbow-bar mechanism in this double-action plunger pump is to be hinged on the eccentric pin shaft of gear face, and this bearing pin is overhang, force-bearing situation extreme difference.

In addition, the hydraulic driving system of hudraulic lift, it is a kind of hydraulic system that typically needs continuous speed adjustment, consider from energy-conservation and operating cost, adopt servo variable displacement axial piston pump contrast of regulating speed ideal, but price and the higher factor of rate of fault that servo variable displacement axial piston pump is extremely expensive, limited its application at hudraulic lift.

Linear motor is one of New-type electric machine of Recent study development, is that electric energy is directly changed into straight-line power plant by one.Linear electric motor have advantages of many outstanding, and as good, easy to maintenance, simple in structure in starting performance etc., in some occasion, linear electric motor have the application of its uniqueness, are that electric rotating machine institute is irreplaceable.Linear electric motor are especially applicable to being applied to needs type frequently reciprocating, have suitable thrust, the occasion of suitable movement velocity and suitable positioning precision.

Summary of the invention

In order to address the above problem, the utility model provide a kind of simple in structure, with low cost, can continuously adjusting flow rate and the pluger type hydraulic pump of the employing linear electric motor of pressure.

The technical solution of the utility model is to provide a kind of pluger type hydraulic pump that adopts linear electric motor, it comprises left plunger and right plunger, described left plunger and right plunger are placed in cavity volume separately ordinatedly, it is characterized in that: also comprise linear electric motor, the output shaft two ends of described linear electric motor respectively arrange a leading screw, and described in two, the thread rotary orientation of leading screw is contrary, helical pitch is identical; The nut that is all threaded on each described leading screw, all fixes a hinged slide on each described nut; Described left plunger and right plunger are symmetrical arranged taking the axis of described leading screw as symmetry axis, equal hinged two toggle links on described left plunger and right plunger, the other end of toggle link hinged slide described in hinged respectively described in two.

Preferably, described linear electric motor are Linear motor servo motor or double output shaft alternating-current variable frequency motor.

Preferably, described in two, the end of cavity volume is equipped with in-line and oil extraction road; Described in-line communicates with fuel tank by one-way valve, and described oil extraction road joins by one-way valve and external hydraulic system.

Preferably, the outlet of the one-way valve on described oil extraction road communicates with voltage stabilizer, and hydraulic executing system is led in the outlet of voltage stabilizer.

Preferably, on described voltage stabilizer, be connected to digital pressure switch.

Preferably, described leading screw is ball screw.

Guilde screw-elbow-bar mechanism that the pluger type hydraulic pump of employing linear electric motor of the present utility model is arranged symmetrically with by driving, then promote two plungers carries out inwards or outside symmetric motion simultaneously, not only can make delivery pressure and the flow of plunger hydraulic pump carry out within a large range automation control and adjusting, and topmost element---the plunger of plunger hydraulic pump, do not bear in theory any radial force, therefore, the friction mode of plunger motion process is very simple, not only can significant prolongation its working life, and can improve mechanical efficiency, be conducive to energy-conservation.In addition, linear servo-actuator has the function of overload repeatedly, can form " electronics flywheel " effect, under the identical condition of output power of motor, can make ouput force improve 4-5 doubly, thereby with respect to traditional mechanical stamping machine, save complex structure and heavy mechanical flywheel.By configure the mover of two numerical control synchronous interactions on the stator of linear electric motor, the original symmetry being realized by complicated mechanical transmission is synchronized with the movement and becomes intellectuality and flexibility; The symmetry of these two movers is synchronized with the movement, and passes to two drift slide blocks by symmetrical toggle link, can be in oil extraction working procedure, and realizable force amplifies; Also can be in the time that oil suction be returned, realize stroke and amplify.

Brief description of the drawings

Fig. 1 is the structural representation of the utility model while adopting the reset mode of pluger type hydraulic pump most preferred embodiment of linear electric motor;

Fig. 2 is the structural representation of the utility model while adopting the working state of pluger type hydraulic pump most preferred embodiment of linear electric motor.

Embodiment

Below embodiment of the present utility model is described in further detail.

As shown in accompanying drawing 1, accompanying drawing 2, the pluger type hydraulic pump of employing linear electric motor of the present utility model comprise linear electric motor 1 and linear electric motor 1 '.Linear electric motor 1 and linear electric motor 1 ' stator 2 and the same straight line of stator 2 ' be positioned at, the hinged slide 4 of mover 3 and mover 3 ' be above provided with and hinged slide 4 '.Mover 3 and mover 3 ' controlled by two-axle interlocking numerical control system (not shown).Hinged slide 4 and hinged slide 4 ' on separately symmetry be hinged with two secondary toggle links 6 and toggle link 6 ', two secondary toggle links 6 and toggle link 6 ' the other end, be articulated with respectively left plunger 8 and right plunger 8 ' upper, left plunger 8 and right plunger 8 ' be placed in ordinatedly cavity volume separately; The end of left and right two cavity volumes 10,10 ' (being the cavity volume of left plunger 8 and right plunger 8 ' correspondence, lower same) is provided with into oil extraction road (not shown); In-line (not shown) communicates with fuel tank (not shown) by one-way valve (not shown), and oil extraction road (not shown) joins by one-way valve and external hydraulic system (not shown).The outlet of the one-way valve (not shown) on oil extraction road communicates with voltage stabilizer (not shown), and hydraulic executing system (not shown) is led in the outlet of voltage stabilizer; On voltage stabilizer, be connected to digital pressure switch (not shown).Two-axle interlocking numerical control system, enter the structure that oil extraction road, one-way valve, fuel tank, voltage stabilizer, digital pressure switch and hydraulic executing system are known and extensively adopted for industry, and non-the utility model innovative point place.

From accompanying drawing 1,2, when linear electric motor 1 and linear electric motor 1 ' work, mover 3 and mover 3 ' carry out inwards or simultaneously outside symmetric motion simultaneously, thereby be fixed on mover 3 and mover 3 ' on hinged slide 4 and hinged slide 4 ' also can corresponding symmetric motion.

When mover 3 and mover 3 ' while are outwards when symmetric motion, be hinged on two toggle links 6 on hinged slide 4 and be hinged on hinged slide 4 ' on two toggle links 6 ' will drive left plunger 8 and the symmetric motion to the inside of right plunger 8 ' while, at this moment, the volume of left and right two cavity volumes expands, form negative pressure, hydraulic oil in fuel tank, under atmospheric effect, is opened one-way valve below, enter respectively left plunger 8 and right plunger 8 ' cavity volume in.When linear electric motor counterrotating, mover 3 and mover 3 ' symmetric motion inwards simultaneously under the effect of positive and negative leading screw, left plunger 8 and right plunger 8 ' under the effect of toggle link, the while is done symmetric motion laterally.At this moment, the volume of the cavity volume of left plunger 8 and right plunger 8 ' correspondence dwindles, and to fluid mineralization pressure, makes to lead to the closed check valve of fuel tank below, and while one-way valve opens above realizes pressure oil output.

Plunger pump of the present utility model, the calculation of pressure formula of output liquid is:

$p=\frac{8\mathrm{M\η}}{{\mathrm{sd}}^2\tan \mathrm{\α}}---\left(1\right)$

Wherein:

M---motor output torque;

D---plunger diameter;

α---toggle link pressure angle;

η---total mechanical efficiency.

From formula (1), the pressure p that oil hydraulic pump is exported, in the situation that torque M, guide screw lead s and plunger diameter d are certain, just depends on the pressure angle α of toggle link.Pressure angle is larger, and the pressure of oil hydraulic pump output is less; Pressure angle is less, and the pressure of oil hydraulic pump output is larger.Therefore,, by the size at pilot pressure angle, can make the delivery pressure of oil hydraulic pump in very large range change.

The formula for displacement calculation of the utility model plunger pump is:

$V=\frac{{\mathrm{\πld}}^2(\cos {\mathrm{\α}}_1-\cos {\mathrm{\α}}_2){\mathrm{\η}}_v}{2}---\left(2\right)$

η _v---the volumetric efficiency of plunger pump.

From formula (2), because cos α is in the constant interval of °-90 °, α=0, be a non-linear function successively decreasing, so α ₁with α ₂even if difference is identical, in the time of diverse location, pump delivery is also different.α ₁with α ₂in the time of larger interval value, discharge capacity is larger; In the time of less interval value, discharge capacity is less.Aggregative formula (1), (2) can be found out, by control system, α are moved in the larger interval of value, can obtain low pressure and mass flow pump; Otherwise, α is moved in the less interval of value, can obtain high-pressure low-flow pump.

Because dynamical element of the present utility model is actuating motor, and promote plunger motion by symmetrical guilde screw-elbow-bar mechanism, so, by the angular displacement of numerical control programming control actuating motor, can select arbitrarily the interval at α place completely, and α ₁with α ₂difference; And by frequency variator, also can control the rotating speed of alternating-current variable frequency motor, add other electric apparatus control apparatus, thereby also can select arbitrarily the interval at α place, and α ₁with α ₂difference.Therefore plunger pump of the present utility model is exported pressure and flow, can carry out continuously within a large range Digital Control and adjusting, be applicable to very much needs pressure and flow are carried out to the frequent occasion of adjusting, be particularly useful for that the needs such as hudraulic lift are high-power, the equipment of continuous speed adjustment.

Because plunger delivery side of pump of the present utility model has connected hydraulic pressure regulator, therefore, can be with stable flow to hydraulic executing system delivery pressure liquid.In addition, on hydraulic pressure regulator, connect digital pressure switch, can, according to the variation of pressure, carry out automation control, made exported pressure can meet different needs.

Above embodiment is only the utility model a kind of mode of execution wherein, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.

Claims (5)

1. one kind adopts the pluger type hydraulic pump of linear electric motor, it comprises left plunger and right plunger, described left plunger and right plunger are placed in cavity volume separately ordinatedly, it is characterized in that: also comprise two linear electric motor, described in two, the stator of linear electric motor is all located along the same line, and all fixes a hinged slide on the mover of each described linear electric motor; Described left plunger and right plunger are symmetrical arranged taking the stator of described linear electric motor as symmetry axis, equal hinged two toggle links on described left plunger and right plunger, the other end of toggle link hinged slide described in hinged respectively described in two.

2. the pluger type hydraulic pump of employing linear electric motor according to claim 1, is characterized in that: described in two, the end of cavity volume is equipped with in-line and oil extraction road; Described in-line communicates with fuel tank by one-way valve, and described oil extraction road joins by one-way valve and external hydraulic system.

3. the pluger type hydraulic pump of employing linear electric motor according to claim 2, is characterized in that: the outlet of the one-way valve on described oil extraction road communicates with voltage stabilizer, and hydraulic executing system is led in the outlet of voltage stabilizer.

4. the pluger type hydraulic pump of employing linear electric motor according to claim 3, is characterized in that: on described voltage stabilizer, be connected to digital pressure switch.

5. the pluger type hydraulic pump of employing linear electric motor according to claim 4, is characterized in that: described in two, the mover of linear electric motor is controlled by two-axle interlocking numerical control system.